/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.systemui.statusbar.notification.people

object EmptySubscription : Subscription {
    override fun unsubscribe() {}
}

class FakeDataSource<T>(
    private val data: T,
    private val subscription: Subscription = EmptySubscription
) : DataSource<T> {
    override fun registerListener(listener: DataListener<T>): Subscription {
        listener.onDataChanged(data)
        return subscription
    }
}